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Figure 1.

Germination percentage of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and Martian regolith MGS-1) and in treatments (0.2 and 0.4 g · L−1 of U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.
Germination percentage of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and Martian regolith MGS-1) and in treatments (0.2 and 0.4 g · L−1 of U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.

Figure 2.

Percentage of the emergence of seedlings of C. annum (A), P. sativum (B), L. sativa (C) e C. arietinum (D) in controls (terrestrial soil and Martian regolith MGS-1) and treatments (0.2 and 0.4 g · L−1 U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.
Percentage of the emergence of seedlings of C. annum (A), P. sativum (B), L. sativa (C) e C. arietinum (D) in controls (terrestrial soil and Martian regolith MGS-1) and treatments (0.2 and 0.4 g · L−1 U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.

Figure 3.

Percentage of germination of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and lunar regolith LHS-1) and treatments (0. 2 and 0. 4 g · L−1 U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.
Percentage of germination of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and lunar regolith LHS-1) and treatments (0. 2 and 0. 4 g · L−1 U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.

Figure 4.

Percentage of the emergence of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and lunar regolith LHS-1) and treatments (0. 2 and 0. 4 g · L−1U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.
Percentage of the emergence of C. annum (A), P. sativum (B), L. sativa (C), and C. arietinum (D) in controls (terrestrial soil and lunar regolith LHS-1) and treatments (0. 2 and 0. 4 g · L−1U. lactuca powder), n=4/10 subsamples (seeds) for each cultivar. Standard Error (SE) upper limits were not capped since germination was 100% with no distinctive ranges.

Figure 5.

Germination speed and seedling emergence of cultivars developed in lunar and Martian regolith when treatment was applied at concentrations of 0.2 g · L−1and 0.4 g · L−1.
Germination speed and seedling emergence of cultivars developed in lunar and Martian regolith when treatment was applied at concentrations of 0.2 g · L−1and 0.4 g · L−1.

Figure 6.

Contents of phytohormones in seeds of P. sativum (pmol/FW) with mean and standard deviation. PeM: Martian regolith pea. PeM0.2: Pea Martian regolith concentration of 0.2 g · L−1. PeM0.4: Pea Martian regolith concentration of 0.4 g · L−1. PeL: Lunar regolith pea. PeL0.2: Pea lunar regolith concentration of 0.2 g · L−1. PeL0.4: Pea lunar regolith concentration 0.4 g · L−1.
Contents of phytohormones in seeds of P. sativum (pmol/FW) with mean and standard deviation. PeM: Martian regolith pea. PeM0.2: Pea Martian regolith concentration of 0.2 g · L−1. PeM0.4: Pea Martian regolith concentration of 0.4 g · L−1. PeL: Lunar regolith pea. PeL0.2: Pea lunar regolith concentration of 0.2 g · L−1. PeL0.4: Pea lunar regolith concentration 0.4 g · L−1.

Figure 7.

Contents of phytohormones (pmol/FW) in seeds of C. annum with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. Legend: PpM: Pepper Martian regolith. PpM0.2: Martian regolith pepper with a concentration of 0.2 g · L−1.PpM0.4: Martian regolith pepper with a concentration of 0.4 g · L−1. PpL: Lunar regolith pepper. PpL0.2: Lunar regolith pepper with a concentration of 0.2 g · L−1. PpL0.4: Lunar regolith pepper with concentration 0.4 g · L−1.
Contents of phytohormones (pmol/FW) in seeds of C. annum with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. Legend: PpM: Pepper Martian regolith. PpM0.2: Martian regolith pepper with a concentration of 0.2 g · L−1.PpM0.4: Martian regolith pepper with a concentration of 0.4 g · L−1. PpL: Lunar regolith pepper. PpL0.2: Lunar regolith pepper with a concentration of 0.2 g · L−1. PpL0.4: Lunar regolith pepper with concentration 0.4 g · L−1.

Figure 8.

Contents of phytohormones (pmol/FW) in seeds of L. sativa with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. Legend: LeM: Lettuce Martian regolith. LeM0.2: Martian regolith lettuce with a concentration of 0.2 g · L−1. LeM0.4: Martian regolith lettuce with a concentration of 0.4 g · L−1. LeL: Lunar regolith lettuce. LeL0.2: Lunar regolith lettuce with a concentration of 0.2 g · L−1. LeL0.4: Lunar regolith lettuce with a concentration of 0.4 g · L−1.
Contents of phytohormones (pmol/FW) in seeds of L. sativa with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. Legend: LeM: Lettuce Martian regolith. LeM0.2: Martian regolith lettuce with a concentration of 0.2 g · L−1. LeM0.4: Martian regolith lettuce with a concentration of 0.4 g · L−1. LeL: Lunar regolith lettuce. LeL0.2: Lunar regolith lettuce with a concentration of 0.2 g · L−1. LeL0.4: Lunar regolith lettuce with a concentration of 0.4 g · L−1.

Figure 9.

Contents of phytohormones (pmol/FW) in seeds of C. arietinum with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. CpM: Martian regolith chickpea. CpM0.2: Martian chickpea regolith concentration of 0.2 g g · L−1. CpM0.4 chickpea Martian regolith concentration of 0.4 g · L−1. CpL: lunar regolith chickpea. CpL0.2: lunar regolith chickpea concentration of 0.2 g. g · L−1. CpL0.4: chickpea lunar regolith concentration 0.4 g · L−1.
Contents of phytohormones (pmol/FW) in seeds of C. arietinum with mean and standard deviation. Peak hormonal concentration for each type of regolith, Martian, and lunar. CpM: Martian regolith chickpea. CpM0.2: Martian chickpea regolith concentration of 0.2 g g · L−1. CpM0.4 chickpea Martian regolith concentration of 0.4 g · L−1. CpL: lunar regolith chickpea. CpL0.2: lunar regolith chickpea concentration of 0.2 g. g · L−1. CpL0.4: chickpea lunar regolith concentration 0.4 g · L−1.

Figure 10.

Hypothetical model representing the interaction of secondary metabolites of U. lactuca and their phytohormone precursors as plant growth regulators.
Hypothetical model representing the interaction of secondary metabolites of U. lactuca and their phytohormone precursors as plant growth regulators.

Estimated cost per kg of macroalgae extract.

Payload Cost Author Total Cost per kg
$4,000.00–$40,000.00 Ehlmann et al. (2005) $50,968.00 – $1,760,000
$1,000.00–$5,000.00 (regular) Zuniga et al. (2015) $14,160.00 – $60,000.00 (Regular)
$5,000.00–$10,000.00 (long-term) $70,000.00 – $144,200.00 (long-term)
$200.00–$300.00 Heldmann et al. (2022) $13,360.00 – $21,120.00

Controlled conditions were maintained in an incubator for seed germination assays in terrestrial soil samples and simulated lunar and Martian regolith.

Conditions Day Night
Photoperiod 16:00 h 8:00 h
Temperature 23 °C 18 °C
Relative Humidity 70% 70%
CO2 400 ppm – 1000 ppm 1000 ppm
Light ~ 400 μmol · m−2 · s−1HPLED N/A

U. lactuca qualitative analysis.

Chemical class Compounds
Alkaloids Vincadifformin
Quinines
Terpenoids Neophytadiene
Phytol
Lactaropallidin
Flavonoids Lucenin 2
Quercetin 7.3′,4′-Trimethoxy
Steroids Digitoxigenin
Fatty acids 5-Octadecenal
Erucic Acid
9-Octadecenoic acid
1-Tricosanol
n-Hexadecanoic acid
Myristate Isopropyl
Phenols Uncharacterized
eISSN:
2332-7774
Język:
Angielski
Częstotliwość wydawania:
2 razy w roku
Dziedziny czasopisma:
Life Sciences, other, Materials Sciences, Physics